Those 7mm-thick hard drives you've seen in some Ultrabooks are already looking a tad on the chunky side. Western Digital has started producing sample versions of a hybrid hard drive (you're not yet looking at it here) that measures just 5mm (0.2in) tall, even as it crams in both flash and a 500GB main disk. If you think the slimmer drive is just the ticket for a best-of-all-worlds laptop that's both fast and capacious, you're not alone: Acer and ASUS have mentioned their co
